Paul louis maurice caron



P. L. M. CARON.

MANUFACTURE OF REINFORCED 0R ORDINARY CONCRETE PIPES BY CENTRIFUGAL FORCE.

APPLICATION FILED JUNE 21, 1920.

Patented Apr. 19, 1921.,

adhering to the mold walls.

UNITED STATES PATENT OFFICE.

PAUL LOUIS MAURICE CARON, OF PARIS, FRANCE.

MANUFACTURE OF REINFORCED 0R ORDINARY CONCRETE PIPES BY CENTRIFU'GAL FORCE.

Application filed June 21,

T 0 all whom it may concern:

Be it known that I, PAUL LoUIs MAURICE CAnoN, citizen of the Republic of France, and resident of Paris, France, (post office address 32 avenue Felix Faure,) have invented new and useful Improvements in the Manufacture of Reinforced or Ordinary Concrete Pipes by Centrifugal Force, which improvements are fully set forth in the following specification.

This invention relates to certain improvements in the manufacture, by centrifugal force, of pipes of either reinforced or ordinary concrete; the concrete being lntroduced into the mold while still in a liquid state and caused to assume the shape of the mold by the action of the centrifugal force exerted upon it.

In the manufacture of cement or concrete pipes by centrifugal force, as above, it is generally advisable, if not essential, to utilize tight molds in order to prevent the eXtrusion of the liquid or plastic concrete through joints and crevices in the mold; and it is also necessary to prevent the concrete from The present invention, therefore, contemplates a form of mold whereby both desiderata mentioned are obtained, such object being effected by providing the mold with an interior jacket or lining. of rubber or other suitable material; this lining not only affording the desired tightness, but avoiding the necessity for greasing the interior of the mold to prevent the concrete from stlcking thereto.

An embodiment of the invention is illustrated in the accompanying drawing, wherein:

Figure 1 is a plan view of the lining sheet rolled into cylindrical shape, with the ends of the sheet arranged to form a butt joint;

Fig. 2 is a plan view showing the sheet wound spirally upon itself to form the cylinder;

Fig. 3 is a cross-sectional view of a molded cylindrical lining which may be used in place of a rolled-up sheet;

Fig. 4 is a cross-sectional view showing a lining fitted in a two-part mold;

Fig. is a diagrammatic plan view of one form of molding machine which may be utilized in. car ying out the invention, the

Specification of Letters Patent.

Patented Apr. 19, 1921.

1920. Serial No. 390,604.

mocid proper being shown in dotted lines; an

Fig. 6 is an end view of Fig. 5, but with the mold in full lines.

Referring more particularly to said drawmg, the lining or jacket may be constructed of a smgle sheet a of rubber, which may be rolled upon itself into cylindrical form, either parallel as in Fig. 1, or spirally as in Fig. 2. In the former instance, the two end edges of the sheet will be disposed immediately opposite each other so as to produce a butt oint; and in the latter instance the edges a are lapped over the body of the sheetand are thinned, in order to conceal the joints and maintain the cylindrical appearance of the jacket.

Instead of constructing the jacket of a single rubber sheet which is rolled upon itself into cylindrical form in either of the two ways just mentioned, the jacket cylinder may be made seamless or jointless, as by molding, casting or other analogous methods, such a cylinder or jacket being illustrated in section in Fig. 3, wherein it is designated 6.

Fig. 4 shows a cylindrical jacket or lining fitted in a twopart cylindrical mold, the sections or members of which are indicated at (Z and c. The jacket here represented is substantially of the type illustrated in Fig. 1, the oint between its ends being indicated at a, and the joints between the ends of the mold sections being indicated at c. As the latter joints are covered by the cylinder or jacket a, there is no necessity for their being made perfect.

Referring to Figs. 5 and 6, which illustrate in a more or less diagrammatic manner one form of molding machine which may be employed to apply the liquid concrete by centrifugal force against the lining of the mold, 1 indicates a suitable electric motor which is connected to drive a horizontal shaft 2 disposed in line with the motor shaft. A second horizontal shaft 3 is arranged in spaced, parallel relation to shaft 2, both shafts being mounted in bearings 4 located in a common horizontal plane. Said shafts are provided, adjacent their ends with flanged supporting collars 5 whereon the mold 6 is adapted to rest; and since the shaft 2 is positively driven by the motor 1, the mold will be frictionally rotated by that shaft and, in turn, will rotate the other shaft 3, the flanged collars 5 preventing endwise movement of the mold. The latter is supplied with the liquid concrete in some suitable manner and, on being rotated as above described, will bring about the applicationof the concrete by centrifugal force against the mold lining, thereby forming the pipe or analogous article; The thickness of the molded article depends, of course, upon the quantity of liquid concrete supplied to the interior of the mold.

In the foregoing description, the jacket or cylinder has been referred to as constructed of rubber, that material having the advantage of not adhering to cement, so

that the necessity for greasing the molds is thus obviated. However, although rubber is at present believed to be the most suitable material, it is to be iurderstood that any other material may be substituted therefor which does not adhere, or adheres only slightly, to cement, and which is sufficiently pliant to become unwound and detached progressively from the cement. Greasy leather, linoleum, wax cloth, thick lubricated fabric, etc, may be mentioned as examples'of such materials;

I claim as my in'vention':--

1. A mold for concrete pipes and the like made by a centrifugal machine, adapted to be rotated for the purpose of applying the liquid concrete against its wall by centrifuga'l force, said mold having a separate flexible lining orjacket fitting its interior to render the same tight and constructed of a non-metallic material which is substantially non-adherent to concrete and which is sufficiently pliant to become unwound and detached progressively from the concrete.

2. A mold for concrete pipes and the like made by a centrifugal machine, adapted to be rotated for the purpose of applying the liquid concrete against its wall by centrifugal force, said mold having fitted within it a separate flexible jacket or lining to render its interior tight, s-ai'd jacket consisting of a single sheet ro'l led upon itself into cylindrical form, which is substantially non-adherent to concrete and which issuffici ently pliant to become unwound and detached progressively from the concrete. V

A mold for concrete pipes and the like made by a centrifugal machine, adapted to be rotated for the purpose of applying the liquid concrete against its wall by centrifugal force, said mold having. fitted within it a separate flexible jacket or lining to render its interior tight, said jacket consisting of a single sheet of rubber rolled upon itself into cylindrical form, and beingsufliciently pliant to become unwound and detached progressively from the concrete. I

In testimony whereof I have signed this specification in the presence of a subscribing witness.

PAUL LOUIS Mansion canon.

lVitness ALPHoNsE NICOLAS. 

